25.1 The notice of race and sailing instructions
shall be made available to each boat before a race begins.

25.2 The meanings of the visual and sound
signals stated in Race Signals
shall not be changed except under rule 86.1(b). The
meanings of any other signals that may be used shall be stated in the notice
of race or sailing instructions.

25.3 When the race committee is required to
display a flag as a visual signal, it may use a flag or other object of a similar
appearance.